\Header{ppregion}{Set Domain for Spatial Point Pattern Analyses}
\keyword{spatial}{ppregion}
\begin{Description}\relax
Sets the rectangular domain \code{(xl, xu)}  x  \code{(yl, yu)}.\end{Description}
\begin{Usage}
\begin{verbatim}
ppregion(xl = 0, xu = 1, yl = 0, yu = 1)
\end{verbatim}
\end{Usage}
\begin{Arguments}
\begin{ldescription}
\item[\code{xl}] Either \code{xl} or a list containing components \code{xl}, \code{xu}, \code{yl}, \code{yu} (such as
a point-process object)

\item[\code{xu}] 
\item[\code{yl}] 
\item[\code{yu}] 
\end{ldescription}
\end{Arguments}
\begin{Value}
none\end{Value}
\begin{Section}{Side Effects}
initializes variables in the \code{C} subroutines.\end{Section}
\begin{References}\relax
Venables, W. N. and Ripley, B. D. (2002)
\emph{Modern Applied Statistics with S.} Fourth edition.  Springer.\end{References}
\begin{SeeAlso}\relax
\code{\Link{ppinit}}, \code{\Link{ppgetregion}}\end{SeeAlso}

